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Finding the Fourth Proportional to 578.40, 867.60 and 193.68

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Solution

The fourth proportional to 578.40, 867.60 and 193.68 is: 290.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.40 : 867.60 = 193.68 : x
  2. Step 2: Convert to fraction form
    578.40/867.60 = 193.68/x
  3. Step 3: Cross multiply
    578.40x = 867.60 × 193.68
  4. Step 4: Simplify right side
    578.40x = 168,036.77
  5. Step 5: Solve for x
    x = 168,036.77/578.40
  6. Step 6: Final answer
    x = 290.52

Related Problems

Find fourth proportional to 289.20, 433.80 and 96.84
Half scale
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Double scale
Find fourth proportional to 579.40, 869.10 and 194.68
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.