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Finding the Fourth Proportional to 1,007.78, 1,390.70 and 565.72

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Solution

The fourth proportional to 1,007.78, 1,390.70 and 565.72 is: 780.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.78 : 1,390.70 = 565.72 : x
  2. Step 2: Convert to fraction form
    1,007.78/1,390.70 = 565.72/x
  3. Step 3: Cross multiply
    1,007.78x = 1,390.70 × 565.72
  4. Step 4: Simplify right side
    1,007.78x = 786,744.74
  5. Step 5: Solve for x
    x = 786,744.74/1,007.78
  6. Step 6: Final answer
    x = 780.67

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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.