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Finding the Fourth Proportional to 1,345.79, 2,018.75 and 371.87

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Solution

The fourth proportional to 1,345.79, 2,018.75 and 371.87 is: 557.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.79 : 2,018.75 = 371.87 : x
  2. Step 2: Convert to fraction form
    1,345.79/2,018.75 = 371.87/x
  3. Step 3: Cross multiply
    1,345.79x = 2,018.75 × 371.87
  4. Step 4: Simplify right side
    1,345.79x = 750,710.70
  5. Step 5: Solve for x
    x = 750,710.70/1,345.79
  6. Step 6: Final answer
    x = 557.82

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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.