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Finding the Fourth Proportional to 1,266.79, 1,898.10 and 778.81

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Solution

The fourth proportional to 1,266.79, 1,898.10 and 778.81 is: 1,166.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.79 : 1,898.10 = 778.81 : x
  2. Step 2: Convert to fraction form
    1,266.79/1,898.10 = 778.81/x
  3. Step 3: Cross multiply
    1,266.79x = 1,898.10 × 778.81
  4. Step 4: Simplify right side
    1,266.79x = 1,478,259.26
  5. Step 5: Solve for x
    x = 1,478,259.26/1,266.79
  6. Step 6: Final answer
    x = 1,166.93

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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.