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Finding the Fourth Proportional to 687,854.50, 949,239.21 and 386,048.50

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Solution

The fourth proportional to 687,854.50, 949,239.21 and 386,048.50 is: 532,746.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,854.50 : 949,239.21 = 386,048.50 : x
  2. Step 2: Convert to fraction form
    687,854.50/949,239.21 = 386,048.50/x
  3. Step 3: Cross multiply
    687,854.50x = 949,239.21 × 386,048.50
  4. Step 4: Simplify right side
    687,854.50x = 366,452,373,161.69
  5. Step 5: Solve for x
    x = 366,452,373,161.69/687,854.50
  6. Step 6: Final answer
    x = 532,746.93

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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.