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Finding the Fourth Proportional to 659,715.60, 989,573.40 and 578,359.20

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Solution

The fourth proportional to 659,715.60, 989,573.40 and 578,359.20 is: 867,538.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,715.60 : 989,573.40 = 578,359.20 : x
  2. Step 2: Convert to fraction form
    659,715.60/989,573.40 = 578,359.20/x
  3. Step 3: Cross multiply
    659,715.60x = 989,573.40 × 578,359.20
  4. Step 4: Simplify right side
    659,715.60x = 572,328,879,965.28
  5. Step 5: Solve for x
    x = 572,328,879,965.28/659,715.60
  6. Step 6: Final answer
    x = 867,538.80

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Double scale
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Similar ratio
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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.