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Finding the Fourth Proportional to 309,899.80, 464,849.70 and 257,411.80

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Solution

The fourth proportional to 309,899.80, 464,849.70 and 257,411.80 is: 386,117.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,899.80 : 464,849.70 = 257,411.80 : x
  2. Step 2: Convert to fraction form
    309,899.80/464,849.70 = 257,411.80/x
  3. Step 3: Cross multiply
    309,899.80x = 464,849.70 × 257,411.80
  4. Step 4: Simplify right side
    309,899.80x = 119,657,798,006.46
  5. Step 5: Solve for x
    x = 119,657,798,006.46/309,899.80
  6. Step 6: Final answer
    x = 386,117.70

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Similar ratio
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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.