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Finding the Fourth Proportional to 115,420, 159,279.60 and 62,428

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Solution

The fourth proportional to 115,420, 159,279.60 and 62,428 is: 86,150.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,420 : 159,279.60 = 62,428 : x
  2. Step 2: Convert to fraction form
    115,420/159,279.60 = 62,428/x
  3. Step 3: Cross multiply
    115,420x = 159,279.60 × 62,428
  4. Step 4: Simplify right side
    115,420x = 9,943,506,868.80
  5. Step 5: Solve for x
    x = 9,943,506,868.80/115,420
  6. Step 6: Final answer
    x = 86,150.64

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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.