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Finding the Fourth Proportional to 78,417.40, 117,626.10 and 76,862.20

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Solution

The fourth proportional to 78,417.40, 117,626.10 and 76,862.20 is: 115,293.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,417.40 : 117,626.10 = 76,862.20 : x
  2. Step 2: Convert to fraction form
    78,417.40/117,626.10 = 76,862.20/x
  3. Step 3: Cross multiply
    78,417.40x = 117,626.10 × 76,862.20
  4. Step 4: Simplify right side
    78,417.40x = 9,041,000,823.42
  5. Step 5: Solve for x
    x = 9,041,000,823.42/78,417.40
  6. Step 6: Final answer
    x = 115,293.30

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1.5x scale

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.