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Finding the Fourth Proportional to 761.79, 1,051.39 and 430.30

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Solution

The fourth proportional to 761.79, 1,051.39 and 430.30 is: 593.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.79 : 1,051.39 = 430.30 : x
  2. Step 2: Convert to fraction form
    761.79/1,051.39 = 430.30/x
  3. Step 3: Cross multiply
    761.79x = 1,051.39 × 430.30
  4. Step 4: Simplify right side
    761.79x = 452,413.12
  5. Step 5: Solve for x
    x = 452,413.12/761.79
  6. Step 6: Final answer
    x = 593.89

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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.