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Finding the Fourth Proportional to 557,560.77, 769,386.13 and 309,210.72

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Solution

The fourth proportional to 557,560.77, 769,386.13 and 309,210.72 is: 426,684.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    557,560.77 : 769,386.13 = 309,210.72 : x
  2. Step 2: Convert to fraction form
    557,560.77/769,386.13 = 309,210.72/x
  3. Step 3: Cross multiply
    557,560.77x = 769,386.13 × 309,210.72
  4. Step 4: Simplify right side
    557,560.77x = 237,902,439,215.31
  5. Step 5: Solve for x
    x = 237,902,439,215.31/557,560.77
  6. Step 6: Final answer
    x = 426,684.32

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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.