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Finding the Fourth Proportional to 665,465.10, 996,885.45 and 398,432.40

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Solution

The fourth proportional to 665,465.10, 996,885.45 and 398,432.40 is: 596,862.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,465.10 : 996,885.45 = 398,432.40 : x
  2. Step 2: Convert to fraction form
    665,465.10/996,885.45 = 398,432.40/x
  3. Step 3: Cross multiply
    665,465.10x = 996,885.45 × 398,432.40
  4. Step 4: Simplify right side
    665,465.10x = 397,191,462,368.58
  5. Step 5: Solve for x
    x = 397,191,462,368.58/665,465.10
  6. Step 6: Final answer
    x = 596,862.95

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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.