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Finding the Fourth Proportional to 700.78, 1,051.80 and 478.36

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Solution

The fourth proportional to 700.78, 1,051.80 and 478.36 is: 717.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.78 : 1,051.80 = 478.36 : x
  2. Step 2: Convert to fraction form
    700.78/1,051.80 = 478.36/x
  3. Step 3: Cross multiply
    700.78x = 1,051.80 × 478.36
  4. Step 4: Simplify right side
    700.78x = 503,139.05
  5. Step 5: Solve for x
    x = 503,139.05/700.78
  6. Step 6: Final answer
    x = 717.97

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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.