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Finding the Fourth Proportional to 712,697.89, 983,523.35 and 390,419.60

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Solution

The fourth proportional to 712,697.89, 983,523.35 and 390,419.60 is: 538,779.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,697.89 : 983,523.35 = 390,419.60 : x
  2. Step 2: Convert to fraction form
    712,697.89/983,523.35 = 390,419.60/x
  3. Step 3: Cross multiply
    712,697.89x = 983,523.35 × 390,419.60
  4. Step 4: Simplify right side
    712,697.89x = 383,986,792,897.66
  5. Step 5: Solve for x
    x = 383,986,792,897.66/712,697.89
  6. Step 6: Final answer
    x = 538,779.19

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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.