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Finding the Fourth Proportional to 1,345.74, 2,018.13 and 421.02

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Solution

The fourth proportional to 1,345.74, 2,018.13 and 421.02 is: 631.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.74 : 2,018.13 = 421.02 : x
  2. Step 2: Convert to fraction form
    1,345.74/2,018.13 = 421.02/x
  3. Step 3: Cross multiply
    1,345.74x = 2,018.13 × 421.02
  4. Step 4: Simplify right side
    1,345.74x = 849,673.09
  5. Step 5: Solve for x
    x = 849,673.09/1,345.74
  6. Step 6: Final answer
    x = 631.38

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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.