Home / 78,117.29-117,126.25-66,275.15

Finding the Fourth Proportional to 78,117.29, 117,126.25 and 66,275.15

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Solution

The fourth proportional to 78,117.29, 117,126.25 and 66,275.15 is: 99,370.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,117.29 : 117,126.25 = 66,275.15 : x
  2. Step 2: Convert to fraction form
    78,117.29/117,126.25 = 66,275.15/x
  3. Step 3: Cross multiply
    78,117.29x = 117,126.25 × 66,275.15
  4. Step 4: Simplify right side
    78,117.29x = 7,762,559,787.69
  5. Step 5: Solve for x
    x = 7,762,559,787.69/78,117.29
  6. Step 6: Final answer
    x = 99,370.57

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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.