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Finding the Fourth Proportional to 661,387.80, 912,688.56 and 389,467.15

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Solution

The fourth proportional to 661,387.80, 912,688.56 and 389,467.15 is: 537,449.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,387.80 : 912,688.56 = 389,467.15 : x
  2. Step 2: Convert to fraction form
    661,387.80/912,688.56 = 389,467.15/x
  3. Step 3: Cross multiply
    661,387.80x = 912,688.56 × 389,467.15
  4. Step 4: Simplify right side
    661,387.80x = 355,462,212,300.80
  5. Step 5: Solve for x
    x = 355,462,212,300.80/661,387.80
  6. Step 6: Final answer
    x = 537,449.00

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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.