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Finding the Fourth Proportional to 713,985.12, 985,306.95 and 391,686.93

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Solution

The fourth proportional to 713,985.12, 985,306.95 and 391,686.93 is: 540,532.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,985.12 : 985,306.95 = 391,686.93 : x
  2. Step 2: Convert to fraction form
    713,985.12/985,306.95 = 391,686.93/x
  3. Step 3: Cross multiply
    713,985.12x = 985,306.95 × 391,686.93
  4. Step 4: Simplify right side
    713,985.12x = 385,931,854,353.16
  5. Step 5: Solve for x
    x = 385,931,854,353.16/713,985.12
  6. Step 6: Final answer
    x = 540,532.07

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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.