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Finding the Fourth Proportional to 87,311.40, 130,880.70 and 42,901.80

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Solution

The fourth proportional to 87,311.40, 130,880.70 and 42,901.80 is: 64,310.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,311.40 : 130,880.70 = 42,901.80 : x
  2. Step 2: Convert to fraction form
    87,311.40/130,880.70 = 42,901.80/x
  3. Step 3: Cross multiply
    87,311.40x = 130,880.70 × 42,901.80
  4. Step 4: Simplify right side
    87,311.40x = 5,615,017,615.26
  5. Step 5: Solve for x
    x = 5,615,017,615.26/87,311.40
  6. Step 6: Final answer
    x = 64,310.25

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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.