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Finding the Fourth Proportional to 712,597.79, 983,385.05 and 390,319.40

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Solution

The fourth proportional to 712,597.79, 983,385.05 and 390,319.40 is: 538,640.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,597.79 : 983,385.05 = 390,319.40 : x
  2. Step 2: Convert to fraction form
    712,597.79/983,385.05 = 390,319.40/x
  3. Step 3: Cross multiply
    712,597.79x = 983,385.05 × 390,319.40
  4. Step 4: Simplify right side
    712,597.79x = 383,834,255,816.45
  5. Step 5: Solve for x
    x = 383,834,255,816.45/712,597.79
  6. Step 6: Final answer
    x = 538,640.82

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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.