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Finding the Fourth Proportional to 716,280.40, 988,446.30 and 393,990.48

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Solution

The fourth proportional to 716,280.40, 988,446.30 and 393,990.48 is: 543,695.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,280.40 : 988,446.30 = 393,990.48 : x
  2. Step 2: Convert to fraction form
    716,280.40/988,446.30 = 393,990.48/x
  3. Step 3: Cross multiply
    716,280.40x = 988,446.30 × 393,990.48
  4. Step 4: Simplify right side
    716,280.40x = 389,438,432,191.22
  5. Step 5: Solve for x
    x = 389,438,432,191.22/716,280.40
  6. Step 6: Final answer
    x = 543,695.50

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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.