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Finding the Fourth Proportional to 661,410.95, 912,720.66 and 389,490.30

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Solution

The fourth proportional to 661,410.95, 912,720.66 and 389,490.30 is: 537,481.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,410.95 : 912,720.66 = 389,490.30 : x
  2. Step 2: Convert to fraction form
    661,410.95/912,720.66 = 389,490.30/x
  3. Step 3: Cross multiply
    661,410.95x = 912,720.66 × 389,490.30
  4. Step 4: Simplify right side
    661,410.95x = 355,495,843,679.60
  5. Step 5: Solve for x
    x = 355,495,843,679.60/661,410.95
  6. Step 6: Final answer
    x = 537,481.04

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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.