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Finding the Fourth Proportional to 717,177.89, 989,707.83 and 390,494.77

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Solution

The fourth proportional to 717,177.89, 989,707.83 and 390,494.77 is: 538,884.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,177.89 : 989,707.83 = 390,494.77 : x
  2. Step 2: Convert to fraction form
    717,177.89/989,707.83 = 390,494.77/x
  3. Step 3: Cross multiply
    717,177.89x = 989,707.83 × 390,494.77
  4. Step 4: Simplify right side
    717,177.89x = 386,475,731,443.05
  5. Step 5: Solve for x
    x = 386,475,731,443.05/717,177.89
  6. Step 6: Final answer
    x = 538,884.06

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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.