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Finding the Fourth Proportional to 499,312.72, 689,412.36 and 308,587.60

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Solution

The fourth proportional to 499,312.72, 689,412.36 and 308,587.60 is: 426,073.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    499,312.72 : 689,412.36 = 308,587.60 : x
  2. Step 2: Convert to fraction form
    499,312.72/689,412.36 = 308,587.60/x
  3. Step 3: Cross multiply
    499,312.72x = 689,412.36 × 308,587.60
  4. Step 4: Simplify right side
    499,312.72x = 212,744,105,582.74
  5. Step 5: Solve for x
    x = 212,744,105,582.74/499,312.72
  6. Step 6: Final answer
    x = 426,073.88

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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.