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Finding the Fourth Proportional to 709.86, 979.66 and 430.11

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Solution

The fourth proportional to 709.86, 979.66 and 430.11 is: 593.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.86 : 979.66 = 430.11 : x
  2. Step 2: Convert to fraction form
    709.86/979.66 = 430.11/x
  3. Step 3: Cross multiply
    709.86x = 979.66 × 430.11
  4. Step 4: Simplify right side
    709.86x = 421,362.10
  5. Step 5: Solve for x
    x = 421,362.10/709.86
  6. Step 6: Final answer
    x = 593.58

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1.5x scale

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.