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Finding the Fourth Proportional to 1,240.07, 1,860.54 and 777.30

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Solution

The fourth proportional to 1,240.07, 1,860.54 and 777.30 is: 1,166.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.07 : 1,860.54 = 777.30 : x
  2. Step 2: Convert to fraction form
    1,240.07/1,860.54 = 777.30/x
  3. Step 3: Cross multiply
    1,240.07x = 1,860.54 × 777.30
  4. Step 4: Simplify right side
    1,240.07x = 1,446,197.74
  5. Step 5: Solve for x
    x = 1,446,197.74/1,240.07
  6. Step 6: Final answer
    x = 1,166.23

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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.