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Finding the Fourth Proportional to 1,547.74, 2,136 and 918.46

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Solution

The fourth proportional to 1,547.74, 2,136 and 918.46 is: 1,267.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,547.74 : 2,136 = 918.46 : x
  2. Step 2: Convert to fraction form
    1,547.74/2,136 = 918.46/x
  3. Step 3: Cross multiply
    1,547.74x = 2,136 × 918.46
  4. Step 4: Simplify right side
    1,547.74x = 1,961,830.56
  5. Step 5: Solve for x
    x = 1,961,830.56/1,547.74
  6. Step 6: Final answer
    x = 1,267.55

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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.