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Finding the Fourth Proportional to 700.20, 1,050.30 and 455.40

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Solution

The fourth proportional to 700.20, 1,050.30 and 455.40 is: 683.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.20 : 1,050.30 = 455.40 : x
  2. Step 2: Convert to fraction form
    700.20/1,050.30 = 455.40/x
  3. Step 3: Cross multiply
    700.20x = 1,050.30 × 455.40
  4. Step 4: Simplify right side
    700.20x = 478,306.62
  5. Step 5: Solve for x
    x = 478,306.62/700.20
  6. Step 6: Final answer
    x = 683.10

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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.