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Finding the Fourth Proportional to 712,540.90, 983,269.60 and 390,188.80

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Solution

The fourth proportional to 712,540.90, 983,269.60 and 390,188.80 is: 538,440.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,540.90 : 983,269.60 = 390,188.80 : x
  2. Step 2: Convert to fraction form
    712,540.90/983,269.60 = 390,188.80/x
  3. Step 3: Cross multiply
    712,540.90x = 983,269.60 × 390,188.80
  4. Step 4: Simplify right side
    712,540.90x = 383,660,785,300.48
  5. Step 5: Solve for x
    x = 383,660,785,300.48/712,540.90
  6. Step 6: Final answer
    x = 538,440.37

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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.