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Finding the Fourth Proportional to 1,370, 1,887.72 and 976.88

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Solution

The fourth proportional to 1,370, 1,887.72 and 976.88 is: 1,346.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370 : 1,887.72 = 976.88 : x
  2. Step 2: Convert to fraction form
    1,370/1,887.72 = 976.88/x
  3. Step 3: Cross multiply
    1,370x = 1,887.72 × 976.88
  4. Step 4: Simplify right side
    1,370x = 1,844,075.91
  5. Step 5: Solve for x
    x = 1,844,075.91/1,370
  6. Step 6: Final answer
    x = 1,346.04

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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.