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Finding the Fourth Proportional to 612,688.59, 845,385.12 and 357,990.57

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Solution

The fourth proportional to 612,688.59, 845,385.12 and 357,990.57 is: 493,953.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,688.59 : 845,385.12 = 357,990.57 : x
  2. Step 2: Convert to fraction form
    612,688.59/845,385.12 = 357,990.57/x
  3. Step 3: Cross multiply
    612,688.59x = 845,385.12 × 357,990.57
  4. Step 4: Simplify right side
    612,688.59x = 302,639,900,978.32
  5. Step 5: Solve for x
    x = 302,639,900,978.32/612,688.59
  6. Step 6: Final answer
    x = 493,953.87

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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.