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Finding the Fourth Proportional to 124,428.40, 186,642.60 and 77,081.20

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Solution

The fourth proportional to 124,428.40, 186,642.60 and 77,081.20 is: 115,621.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,428.40 : 186,642.60 = 77,081.20 : x
  2. Step 2: Convert to fraction form
    124,428.40/186,642.60 = 77,081.20/x
  3. Step 3: Cross multiply
    124,428.40x = 186,642.60 × 77,081.20
  4. Step 4: Simplify right side
    124,428.40x = 14,386,635,579.12
  5. Step 5: Solve for x
    x = 14,386,635,579.12/124,428.40
  6. Step 6: Final answer
    x = 115,621.80

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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.