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Finding the Fourth Proportional to 611,145.60, 916,718.40 and 485,174.40

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Solution

The fourth proportional to 611,145.60, 916,718.40 and 485,174.40 is: 727,761.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,145.60 : 916,718.40 = 485,174.40 : x
  2. Step 2: Convert to fraction form
    611,145.60/916,718.40 = 485,174.40/x
  3. Step 3: Cross multiply
    611,145.60x = 916,718.40 × 485,174.40
  4. Step 4: Simplify right side
    611,145.60x = 444,768,299,688.96
  5. Step 5: Solve for x
    x = 444,768,299,688.96/611,145.60
  6. Step 6: Final answer
    x = 727,761.60

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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.