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Finding the Fourth Proportional to 1,385.71, 2,077.95 and 692.70

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Solution

The fourth proportional to 1,385.71, 2,077.95 and 692.70 is: 1,038.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.71 : 2,077.95 = 692.70 : x
  2. Step 2: Convert to fraction form
    1,385.71/2,077.95 = 692.70/x
  3. Step 3: Cross multiply
    1,385.71x = 2,077.95 × 692.70
  4. Step 4: Simplify right side
    1,385.71x = 1,439,402.46
  5. Step 5: Solve for x
    x = 1,439,402.46/1,385.71
  6. Step 6: Final answer
    x = 1,038.75

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1.5x scale

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.