Home / 90,721.40-136,082.10-65,643.80

Finding the Fourth Proportional to 90,721.40, 136,082.10 and 65,643.80

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Solution

The fourth proportional to 90,721.40, 136,082.10 and 65,643.80 is: 98,465.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,721.40 : 136,082.10 = 65,643.80 : x
  2. Step 2: Convert to fraction form
    90,721.40/136,082.10 = 65,643.80/x
  3. Step 3: Cross multiply
    90,721.40x = 136,082.10 × 65,643.80
  4. Step 4: Simplify right side
    90,721.40x = 8,932,946,155.98
  5. Step 5: Solve for x
    x = 8,932,946,155.98/90,721.40
  6. Step 6: Final answer
    x = 98,465.70

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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.