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Finding the Fourth Proportional to 1,275.36, 1,909.80 and 786.93

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Solution

The fourth proportional to 1,275.36, 1,909.80 and 786.93 is: 1,178.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.36 : 1,909.80 = 786.93 : x
  2. Step 2: Convert to fraction form
    1,275.36/1,909.80 = 786.93/x
  3. Step 3: Cross multiply
    1,275.36x = 1,909.80 × 786.93
  4. Step 4: Simplify right side
    1,275.36x = 1,502,878.91
  5. Step 5: Solve for x
    x = 1,502,878.91/1,275.36
  6. Step 6: Final answer
    x = 1,178.40

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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.