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Finding the Fourth Proportional to 702.56, 1,053.60 and 291.20

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Solution

The fourth proportional to 702.56, 1,053.60 and 291.20 is: 436.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.56 : 1,053.60 = 291.20 : x
  2. Step 2: Convert to fraction form
    702.56/1,053.60 = 291.20/x
  3. Step 3: Cross multiply
    702.56x = 1,053.60 × 291.20
  4. Step 4: Simplify right side
    702.56x = 306,808.32
  5. Step 5: Solve for x
    x = 306,808.32/702.56
  6. Step 6: Final answer
    x = 436.70

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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.