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Finding the Fourth Proportional to 458,432.60, 687,648.90 and 309,133.40

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Solution

The fourth proportional to 458,432.60, 687,648.90 and 309,133.40 is: 463,700.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,432.60 : 687,648.90 = 309,133.40 : x
  2. Step 2: Convert to fraction form
    458,432.60/687,648.90 = 309,133.40/x
  3. Step 3: Cross multiply
    458,432.60x = 687,648.90 × 309,133.40
  4. Step 4: Simplify right side
    458,432.60x = 212,575,242,463.26
  5. Step 5: Solve for x
    x = 212,575,242,463.26/458,432.60
  6. Step 6: Final answer
    x = 463,700.10

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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.