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Finding the Fourth Proportional to 553,111.38, 763,235.28 and 311,389.56

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Solution

The fourth proportional to 553,111.38, 763,235.28 and 311,389.56 is: 429,684.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,111.38 : 763,235.28 = 311,389.56 : x
  2. Step 2: Convert to fraction form
    553,111.38/763,235.28 = 311,389.56/x
  3. Step 3: Cross multiply
    553,111.38x = 763,235.28 × 311,389.56
  4. Step 4: Simplify right side
    553,111.38x = 237,663,498,015.68
  5. Step 5: Solve for x
    x = 237,663,498,015.68/553,111.38
  6. Step 6: Final answer
    x = 429,684.70

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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.