Home / 579,810.20-869,715.30-390,853.40

Finding the Fourth Proportional to 579,810.20, 869,715.30 and 390,853.40

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Solution

The fourth proportional to 579,810.20, 869,715.30 and 390,853.40 is: 586,280.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,810.20 : 869,715.30 = 390,853.40 : x
  2. Step 2: Convert to fraction form
    579,810.20/869,715.30 = 390,853.40/x
  3. Step 3: Cross multiply
    579,810.20x = 869,715.30 × 390,853.40
  4. Step 4: Simplify right side
    579,810.20x = 339,931,182,037.02
  5. Step 5: Solve for x
    x = 339,931,182,037.02/579,810.20
  6. Step 6: Final answer
    x = 586,280.10

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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.