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Finding the Fourth Proportional to 1,315.62, 1,973.97 and 666.81

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Solution

The fourth proportional to 1,315.62, 1,973.97 and 666.81 is: 1,000.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.62 : 1,973.97 = 666.81 : x
  2. Step 2: Convert to fraction form
    1,315.62/1,973.97 = 666.81/x
  3. Step 3: Cross multiply
    1,315.62x = 1,973.97 × 666.81
  4. Step 4: Simplify right side
    1,315.62x = 1,316,262.94
  5. Step 5: Solve for x
    x = 1,316,262.94/1,315.62
  6. Step 6: Final answer
    x = 1,000.49

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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.