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Finding the Fourth Proportional to 86,117.80, 129,030.90 and 56,520.40

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Solution

The fourth proportional to 86,117.80, 129,030.90 and 56,520.40 is: 84,684.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,117.80 : 129,030.90 = 56,520.40 : x
  2. Step 2: Convert to fraction form
    86,117.80/129,030.90 = 56,520.40/x
  3. Step 3: Cross multiply
    86,117.80x = 129,030.90 × 56,520.40
  4. Step 4: Simplify right side
    86,117.80x = 7,292,878,080.36
  5. Step 5: Solve for x
    x = 7,292,878,080.36/86,117.80
  6. Step 6: Final answer
    x = 84,684.91

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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.