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Finding the Fourth Proportional to 880.69, 1,215.30 and 487.69

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Solution

The fourth proportional to 880.69, 1,215.30 and 487.69 is: 672.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.69 : 1,215.30 = 487.69 : x
  2. Step 2: Convert to fraction form
    880.69/1,215.30 = 487.69/x
  3. Step 3: Cross multiply
    880.69x = 1,215.30 × 487.69
  4. Step 4: Simplify right side
    880.69x = 592,681.14
  5. Step 5: Solve for x
    x = 592,681.14/880.69
  6. Step 6: Final answer
    x = 672.98

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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.