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Finding the Fourth Proportional to 1,345.46, 2,018.45 and 420.98

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Solution

The fourth proportional to 1,345.46, 2,018.45 and 420.98 is: 631.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.46 : 2,018.45 = 420.98 : x
  2. Step 2: Convert to fraction form
    1,345.46/2,018.45 = 420.98/x
  3. Step 3: Cross multiply
    1,345.46x = 2,018.45 × 420.98
  4. Step 4: Simplify right side
    1,345.46x = 849,718.04
  5. Step 5: Solve for x
    x = 849,718.04/1,345.46
  6. Step 6: Final answer
    x = 631.55

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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.