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Finding the Fourth Proportional to 712,568.18, 983,309 and 390,279.72

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Solution

The fourth proportional to 712,568.18, 983,309 and 390,279.72 is: 538,566.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,568.18 : 983,309 = 390,279.72 : x
  2. Step 2: Convert to fraction form
    712,568.18/983,309 = 390,279.72/x
  3. Step 3: Cross multiply
    712,568.18x = 983,309 × 390,279.72
  4. Step 4: Simplify right side
    712,568.18x = 383,765,561,193.48
  5. Step 5: Solve for x
    x = 383,765,561,193.48/712,568.18
  6. Step 6: Final answer
    x = 538,566.80

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1.5x scale

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.