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Finding the Fourth Proportional to 1,239.04, 1,709.53 and 885.07

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Solution

The fourth proportional to 1,239.04, 1,709.53 and 885.07 is: 1,221.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.04 : 1,709.53 = 885.07 : x
  2. Step 2: Convert to fraction form
    1,239.04/1,709.53 = 885.07/x
  3. Step 3: Cross multiply
    1,239.04x = 1,709.53 × 885.07
  4. Step 4: Simplify right side
    1,239.04x = 1,513,047.23
  5. Step 5: Solve for x
    x = 1,513,047.23/1,239.04
  6. Step 6: Final answer
    x = 1,221.15

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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.