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Finding the Fourth Proportional to 659,983.20, 989,780.40 and 260,491.20

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Solution

The fourth proportional to 659,983.20, 989,780.40 and 260,491.20 is: 390,660.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,983.20 : 989,780.40 = 260,491.20 : x
  2. Step 2: Convert to fraction form
    659,983.20/989,780.40 = 260,491.20/x
  3. Step 3: Cross multiply
    659,983.20x = 989,780.40 × 260,491.20
  4. Step 4: Simplify right side
    659,983.20x = 257,829,084,132.48
  5. Step 5: Solve for x
    x = 257,829,084,132.48/659,983.20
  6. Step 6: Final answer
    x = 390,660.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.