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Finding the Fourth Proportional to 1,038.65, 1,434.35 and 665.80

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Solution

The fourth proportional to 1,038.65, 1,434.35 and 665.80 is: 919.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.65 : 1,434.35 = 665.80 : x
  2. Step 2: Convert to fraction form
    1,038.65/1,434.35 = 665.80/x
  3. Step 3: Cross multiply
    1,038.65x = 1,434.35 × 665.80
  4. Step 4: Simplify right side
    1,038.65x = 954,988.31
  5. Step 5: Solve for x
    x = 954,988.31/1,038.65
  6. Step 6: Final answer
    x = 919.46

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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.