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Finding the Fourth Proportional to 660,209.10, 990,641.70 and 260,862.90

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Solution

The fourth proportional to 660,209.10, 990,641.70 and 260,862.90 is: 391,423.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,209.10 : 990,641.70 = 260,862.90 : x
  2. Step 2: Convert to fraction form
    660,209.10/990,641.70 = 260,862.90/x
  3. Step 3: Cross multiply
    660,209.10x = 990,641.70 × 260,862.90
  4. Step 4: Simplify right side
    660,209.10x = 258,421,666,722.93
  5. Step 5: Solve for x
    x = 258,421,666,722.93/660,209.10
  6. Step 6: Final answer
    x = 391,423.97

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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.