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Finding the Fourth Proportional to 749.30, 1,123.28 and 383.90

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Solution

The fourth proportional to 749.30, 1,123.28 and 383.90 is: 575.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.30 : 1,123.28 = 383.90 : x
  2. Step 2: Convert to fraction form
    749.30/1,123.28 = 383.90/x
  3. Step 3: Cross multiply
    749.30x = 1,123.28 × 383.90
  4. Step 4: Simplify right side
    749.30x = 431,225.27
  5. Step 5: Solve for x
    x = 431,225.27/749.30
  6. Step 6: Final answer
    x = 575.50

Related Problems

Find fourth proportional to 374.65, 561.64 and 191.95
Half scale
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Double scale
Find fourth proportional to 750.30, 1,124.77 and 384.90
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.