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Finding the Fourth Proportional to 1,505.76, 2,078.13 and 916.38

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Solution

The fourth proportional to 1,505.76, 2,078.13 and 916.38 is: 1,264.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,505.76 : 2,078.13 = 916.38 : x
  2. Step 2: Convert to fraction form
    1,505.76/2,078.13 = 916.38/x
  3. Step 3: Cross multiply
    1,505.76x = 2,078.13 × 916.38
  4. Step 4: Simplify right side
    1,505.76x = 1,904,356.77
  5. Step 5: Solve for x
    x = 1,904,356.77/1,505.76
  6. Step 6: Final answer
    x = 1,264.71

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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.