Home / 86,621.13-129,931.70-20,957.13

Finding the Fourth Proportional to 86,621.13, 129,931.70 and 20,957.13

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Solution

The fourth proportional to 86,621.13, 129,931.70 and 20,957.13 is: 31,435.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,621.13 : 129,931.70 = 20,957.13 : x
  2. Step 2: Convert to fraction form
    86,621.13/129,931.70 = 20,957.13/x
  3. Step 3: Cross multiply
    86,621.13x = 129,931.70 × 20,957.13
  4. Step 4: Simplify right side
    86,621.13x = 2,722,995,528.02
  5. Step 5: Solve for x
    x = 2,722,995,528.02/86,621.13
  6. Step 6: Final answer
    x = 31,435.70

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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.