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Finding the Fourth Proportional to 1,109.11, 1,530.81 and 637.08

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Solution

The fourth proportional to 1,109.11, 1,530.81 and 637.08 is: 879.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.11 : 1,530.81 = 637.08 : x
  2. Step 2: Convert to fraction form
    1,109.11/1,530.81 = 637.08/x
  3. Step 3: Cross multiply
    1,109.11x = 1,530.81 × 637.08
  4. Step 4: Simplify right side
    1,109.11x = 975,248.43
  5. Step 5: Solve for x
    x = 975,248.43/1,109.11
  6. Step 6: Final answer
    x = 879.31

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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.