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Finding the Fourth Proportional to 559,392.18, 771,966.51 and 317,679.78

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Solution

The fourth proportional to 559,392.18, 771,966.51 and 317,679.78 is: 438,401.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    559,392.18 : 771,966.51 = 317,679.78 : x
  2. Step 2: Convert to fraction form
    559,392.18/771,966.51 = 317,679.78/x
  3. Step 3: Cross multiply
    559,392.18x = 771,966.51 × 317,679.78
  4. Step 4: Simplify right side
    559,392.18x = 245,238,151,064.17
  5. Step 5: Solve for x
    x = 245,238,151,064.17/559,392.18
  6. Step 6: Final answer
    x = 438,401.11

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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.