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Finding the Fourth Proportional to 1,187.34, 1,638.51 and 656.21

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Solution

The fourth proportional to 1,187.34, 1,638.51 and 656.21 is: 905.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.34 : 1,638.51 = 656.21 : x
  2. Step 2: Convert to fraction form
    1,187.34/1,638.51 = 656.21/x
  3. Step 3: Cross multiply
    1,187.34x = 1,638.51 × 656.21
  4. Step 4: Simplify right side
    1,187.34x = 1,075,210.74
  5. Step 5: Solve for x
    x = 1,075,210.74/1,187.34
  6. Step 6: Final answer
    x = 905.56

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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.