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Finding the Fourth Proportional to 5,287.69, 7,931.66 and 1,777.74

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Solution

The fourth proportional to 5,287.69, 7,931.66 and 1,777.74 is: 2,666.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,287.69 : 7,931.66 = 1,777.74 : x
  2. Step 2: Convert to fraction form
    5,287.69/7,931.66 = 1,777.74/x
  3. Step 3: Cross multiply
    5,287.69x = 7,931.66 × 1,777.74
  4. Step 4: Simplify right side
    5,287.69x = 14,100,420.36
  5. Step 5: Solve for x
    x = 14,100,420.36/5,287.69
  6. Step 6: Final answer
    x = 2,666.65

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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.