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Finding the Fourth Proportional to 458,810.60, 687,559.80 and 318,405.20

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Solution

The fourth proportional to 458,810.60, 687,559.80 and 318,405.20 is: 477,152.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,810.60 : 687,559.80 = 318,405.20 : x
  2. Step 2: Convert to fraction form
    458,810.60/687,559.80 = 318,405.20/x
  3. Step 3: Cross multiply
    458,810.60x = 687,559.80 × 318,405.20
  4. Step 4: Simplify right side
    458,810.60x = 218,922,615,630.96
  5. Step 5: Solve for x
    x = 218,922,615,630.96/458,810.60
  6. Step 6: Final answer
    x = 477,152.48

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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.