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Finding the Fourth Proportional to 1,692.32, 2,538.45 and 870.15

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Solution

The fourth proportional to 1,692.32, 2,538.45 and 870.15 is: 1,305.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,692.32 : 2,538.45 = 870.15 : x
  2. Step 2: Convert to fraction form
    1,692.32/2,538.45 = 870.15/x
  3. Step 3: Cross multiply
    1,692.32x = 2,538.45 × 870.15
  4. Step 4: Simplify right side
    1,692.32x = 2,208,832.27
  5. Step 5: Solve for x
    x = 2,208,832.27/1,692.32
  6. Step 6: Final answer
    x = 1,305.21

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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.