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Finding the Fourth Proportional to 1,545.16, 2,315.81 and 666.66

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Solution

The fourth proportional to 1,545.16, 2,315.81 and 666.66 is: 999.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,545.16 : 2,315.81 = 666.66 : x
  2. Step 2: Convert to fraction form
    1,545.16/2,315.81 = 666.66/x
  3. Step 3: Cross multiply
    1,545.16x = 2,315.81 × 666.66
  4. Step 4: Simplify right side
    1,545.16x = 1,543,864.50
  5. Step 5: Solve for x
    x = 1,543,864.50/1,545.16
  6. Step 6: Final answer
    x = 999.16

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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.