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Finding the Fourth Proportional to 870.08, 1,307.08 and 505.76

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Solution

The fourth proportional to 870.08, 1,307.08 and 505.76 is: 759.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.08 : 1,307.08 = 505.76 : x
  2. Step 2: Convert to fraction form
    870.08/1,307.08 = 505.76/x
  3. Step 3: Cross multiply
    870.08x = 1,307.08 × 505.76
  4. Step 4: Simplify right side
    870.08x = 661,068.78
  5. Step 5: Solve for x
    x = 661,068.78/870.08
  6. Step 6: Final answer
    x = 759.78

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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.