Home / 280,785.16-421,115.64-81,062.11

Finding the Fourth Proportional to 280,785.16, 421,115.64 and 81,062.11

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Solution

The fourth proportional to 280,785.16, 421,115.64 and 81,062.11 is: 121,575.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,785.16 : 421,115.64 = 81,062.11 : x
  2. Step 2: Convert to fraction form
    280,785.16/421,115.64 = 81,062.11/x
  3. Step 3: Cross multiply
    280,785.16x = 421,115.64 × 81,062.11
  4. Step 4: Simplify right side
    280,785.16x = 34,136,522,332.40
  5. Step 5: Solve for x
    x = 34,136,522,332.40/280,785.16
  6. Step 6: Final answer
    x = 121,575.24

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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.