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Finding the Fourth Proportional to 712,487.16, 983,210.27 and 390,188.97

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Solution

The fourth proportional to 712,487.16, 983,210.27 and 390,188.97 is: 538,448.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,487.16 : 983,210.27 = 390,188.97 : x
  2. Step 2: Convert to fraction form
    712,487.16/983,210.27 = 390,188.97/x
  3. Step 3: Cross multiply
    712,487.16x = 983,210.27 × 390,188.97
  4. Step 4: Simplify right side
    712,487.16x = 383,637,800,593.78
  5. Step 5: Solve for x
    x = 383,637,800,593.78/712,487.16
  6. Step 6: Final answer
    x = 538,448.72

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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.