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Finding the Fourth Proportional to 280,240.40, 420,427.31 and 90,700.77

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Solution

The fourth proportional to 280,240.40, 420,427.31 and 90,700.77 is: 136,072.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,240.40 : 420,427.31 = 90,700.77 : x
  2. Step 2: Convert to fraction form
    280,240.40/420,427.31 = 90,700.77/x
  3. Step 3: Cross multiply
    280,240.40x = 420,427.31 × 90,700.77
  4. Step 4: Simplify right side
    280,240.40x = 38,133,081,869.13
  5. Step 5: Solve for x
    x = 38,133,081,869.13/280,240.40
  6. Step 6: Final answer
    x = 136,072.75

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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.