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Finding the Fourth Proportional to 1,368.76, 1,888.88 and 747.76

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Solution

The fourth proportional to 1,368.76, 1,888.88 and 747.76 is: 1,031.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.76 : 1,888.88 = 747.76 : x
  2. Step 2: Convert to fraction form
    1,368.76/1,888.88 = 747.76/x
  3. Step 3: Cross multiply
    1,368.76x = 1,888.88 × 747.76
  4. Step 4: Simplify right side
    1,368.76x = 1,412,428.91
  5. Step 5: Solve for x
    x = 1,412,428.91/1,368.76
  6. Step 6: Final answer
    x = 1,031.90

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Find fourth proportional to 684.38, 944.44 and 373.88
Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.