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Finding the Fourth Proportional to 617,142.86, 851,314.19 and 358,990.76

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Solution

The fourth proportional to 617,142.86, 851,314.19 and 358,990.76 is: 495,207.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    617,142.86 : 851,314.19 = 358,990.76 : x
  2. Step 2: Convert to fraction form
    617,142.86/851,314.19 = 358,990.76/x
  3. Step 3: Cross multiply
    617,142.86x = 851,314.19 × 358,990.76
  4. Step 4: Simplify right side
    617,142.86x = 305,613,922,015.36
  5. Step 5: Solve for x
    x = 305,613,922,015.36/617,142.86
  6. Step 6: Final answer
    x = 495,207.75

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.