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Finding the Fourth Proportional to 399,590.76, 551,069.70 and 312,387.24

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Solution

The fourth proportional to 399,590.76, 551,069.70 and 312,387.24 is: 430,808.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,590.76 : 551,069.70 = 312,387.24 : x
  2. Step 2: Convert to fraction form
    399,590.76/551,069.70 = 312,387.24/x
  3. Step 3: Cross multiply
    399,590.76x = 551,069.70 × 312,387.24
  4. Step 4: Simplify right side
    399,590.76x = 172,147,142,630.63
  5. Step 5: Solve for x
    x = 172,147,142,630.63/399,590.76
  6. Step 6: Final answer
    x = 430,808.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.