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Finding the Fourth Proportional to 830.42, 1,145.78 and 719.70

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Solution

The fourth proportional to 830.42, 1,145.78 and 719.70 is: 993.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.42 : 1,145.78 = 719.70 : x
  2. Step 2: Convert to fraction form
    830.42/1,145.78 = 719.70/x
  3. Step 3: Cross multiply
    830.42x = 1,145.78 × 719.70
  4. Step 4: Simplify right side
    830.42x = 824,614.27
  5. Step 5: Solve for x
    x = 824,614.27/830.42
  6. Step 6: Final answer
    x = 993.01

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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.