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Finding the Fourth Proportional to 265,717.71, 398,508.53 and 78,685.47

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Solution

The fourth proportional to 265,717.71, 398,508.53 and 78,685.47 is: 118,008.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,717.71 : 398,508.53 = 78,685.47 : x
  2. Step 2: Convert to fraction form
    265,717.71/398,508.53 = 78,685.47/x
  3. Step 3: Cross multiply
    265,717.71x = 398,508.53 × 78,685.47
  4. Step 4: Simplify right side
    265,717.71x = 31,356,830,588.63
  5. Step 5: Solve for x
    x = 31,356,830,588.63/265,717.71
  6. Step 6: Final answer
    x = 118,008.06

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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.