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Finding the Fourth Proportional to 870,128.32, 1,305,139.74 and 517,387

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Solution

The fourth proportional to 870,128.32, 1,305,139.74 and 517,387 is: 776,049.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    870,128.32 : 1,305,139.74 = 517,387 : x
  2. Step 2: Convert to fraction form
    870,128.32/1,305,139.74 = 517,387/x
  3. Step 3: Cross multiply
    870,128.32x = 1,305,139.74 × 517,387
  4. Step 4: Simplify right side
    870,128.32x = 675,262,334,659.38
  5. Step 5: Solve for x
    x = 675,262,334,659.38/870,128.32
  6. Step 6: Final answer
    x = 776,049.14

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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.