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Finding the Fourth Proportional to 78,531.20, 109,710.40 and 78,531.20

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Solution

The fourth proportional to 78,531.20, 109,710.40 and 78,531.20 is: 109,710.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,531.20 : 109,710.40 = 78,531.20 : x
  2. Step 2: Convert to fraction form
    78,531.20/109,710.40 = 78,531.20/x
  3. Step 3: Cross multiply
    78,531.20x = 109,710.40 × 78,531.20
  4. Step 4: Simplify right side
    78,531.20x = 8,615,689,364.48
  5. Step 5: Solve for x
    x = 8,615,689,364.48/78,531.20
  6. Step 6: Final answer
    x = 109,710.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.