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Finding the Fourth Proportional to 153,781.74, 212,218.14 and 85,798.76

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Solution

The fourth proportional to 153,781.74, 212,218.14 and 85,798.76 is: 118,401.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,781.74 : 212,218.14 = 85,798.76 : x
  2. Step 2: Convert to fraction form
    153,781.74/212,218.14 = 85,798.76/x
  3. Step 3: Cross multiply
    153,781.74x = 212,218.14 × 85,798.76
  4. Step 4: Simplify right side
    153,781.74x = 18,208,053,715.89
  5. Step 5: Solve for x
    x = 18,208,053,715.89/153,781.74
  6. Step 6: Final answer
    x = 118,401.92

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Half scale
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Double scale
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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.