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Finding the Fourth Proportional to 779.72, 1,076 and 430.38

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Solution

The fourth proportional to 779.72, 1,076 and 430.38 is: 593.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.72 : 1,076 = 430.38 : x
  2. Step 2: Convert to fraction form
    779.72/1,076 = 430.38/x
  3. Step 3: Cross multiply
    779.72x = 1,076 × 430.38
  4. Step 4: Simplify right side
    779.72x = 463,088.88
  5. Step 5: Solve for x
    x = 463,088.88/779.72
  6. Step 6: Final answer
    x = 593.92

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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.