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Finding the Fourth Proportional to 1,575.84, 2,174.78 and 912.93

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Solution

The fourth proportional to 1,575.84, 2,174.78 and 912.93 is: 1,259.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,575.84 : 2,174.78 = 912.93 : x
  2. Step 2: Convert to fraction form
    1,575.84/2,174.78 = 912.93/x
  3. Step 3: Cross multiply
    1,575.84x = 2,174.78 × 912.93
  4. Step 4: Simplify right side
    1,575.84x = 1,985,421.91
  5. Step 5: Solve for x
    x = 1,985,421.91/1,575.84
  6. Step 6: Final answer
    x = 1,259.91

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1.5x scale

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.