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Finding the Fourth Proportional to 1,019.17, 1,528.64 and 692.21

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Solution

The fourth proportional to 1,019.17, 1,528.64 and 692.21 is: 1,038.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.17 : 1,528.64 = 692.21 : x
  2. Step 2: Convert to fraction form
    1,019.17/1,528.64 = 692.21/x
  3. Step 3: Cross multiply
    1,019.17x = 1,528.64 × 692.21
  4. Step 4: Simplify right side
    1,019.17x = 1,058,139.89
  5. Step 5: Solve for x
    x = 1,058,139.89/1,019.17
  6. Step 6: Final answer
    x = 1,038.24

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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.