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Finding the Fourth Proportional to 661,323.81, 912,711.29 and 389,417.01

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Solution

The fourth proportional to 661,323.81, 912,711.29 and 389,417.01 is: 537,445.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,323.81 : 912,711.29 = 389,417.01 : x
  2. Step 2: Convert to fraction form
    661,323.81/912,711.29 = 389,417.01/x
  3. Step 3: Cross multiply
    661,323.81x = 912,711.29 × 389,417.01
  4. Step 4: Simplify right side
    661,323.81x = 355,425,299,597.96
  5. Step 5: Solve for x
    x = 355,425,299,597.96/661,323.81
  6. Step 6: Final answer
    x = 537,445.19

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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.