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Finding the Fourth Proportional to 1,009.01, 1,513.49 and 315.65

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Solution

The fourth proportional to 1,009.01, 1,513.49 and 315.65 is: 473.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.01 : 1,513.49 = 315.65 : x
  2. Step 2: Convert to fraction form
    1,009.01/1,513.49 = 315.65/x
  3. Step 3: Cross multiply
    1,009.01x = 1,513.49 × 315.65
  4. Step 4: Simplify right side
    1,009.01x = 477,726.81
  5. Step 5: Solve for x
    x = 477,726.81/1,009.01
  6. Step 6: Final answer
    x = 473.46

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.