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Finding the Fourth Proportional to 1,072.90, 1,480.45 and 630.94

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Solution

The fourth proportional to 1,072.90, 1,480.45 and 630.94 is: 870.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.90 : 1,480.45 = 630.94 : x
  2. Step 2: Convert to fraction form
    1,072.90/1,480.45 = 630.94/x
  3. Step 3: Cross multiply
    1,072.90x = 1,480.45 × 630.94
  4. Step 4: Simplify right side
    1,072.90x = 934,075.12
  5. Step 5: Solve for x
    x = 934,075.12/1,072.90
  6. Step 6: Final answer
    x = 870.61

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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.