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Finding the Fourth Proportional to 579,931.90, 869,897.85 and 411,970.30

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Solution

The fourth proportional to 579,931.90, 869,897.85 and 411,970.30 is: 617,955.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,931.90 : 869,897.85 = 411,970.30 : x
  2. Step 2: Convert to fraction form
    579,931.90/869,897.85 = 411,970.30/x
  3. Step 3: Cross multiply
    579,931.90x = 869,897.85 × 411,970.30
  4. Step 4: Simplify right side
    579,931.90x = 358,372,078,233.86
  5. Step 5: Solve for x
    x = 358,372,078,233.86/579,931.90
  6. Step 6: Final answer
    x = 617,955.45

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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.