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Finding the Fourth Proportional to 718,303.75, 991,266.05 and 396,025.40

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Solution

The fourth proportional to 718,303.75, 991,266.05 and 396,025.40 is: 546,518.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,303.75 : 991,266.05 = 396,025.40 : x
  2. Step 2: Convert to fraction form
    718,303.75/991,266.05 = 396,025.40/x
  3. Step 3: Cross multiply
    718,303.75x = 991,266.05 × 396,025.40
  4. Step 4: Simplify right side
    718,303.75x = 392,566,537,425.90
  5. Step 5: Solve for x
    x = 392,566,537,425.90/718,303.75
  6. Step 6: Final answer
    x = 546,518.85

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1.5x scale

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.