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Finding the Fourth Proportional to 870.90, 1,201.55 and 497.62

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Solution

The fourth proportional to 870.90, 1,201.55 and 497.62 is: 686.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.90 : 1,201.55 = 497.62 : x
  2. Step 2: Convert to fraction form
    870.90/1,201.55 = 497.62/x
  3. Step 3: Cross multiply
    870.90x = 1,201.55 × 497.62
  4. Step 4: Simplify right side
    870.90x = 597,915.31
  5. Step 5: Solve for x
    x = 597,915.31/870.90
  6. Step 6: Final answer
    x = 686.55

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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.