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Finding the Fourth Proportional to 1,140.25, 1,573.15 and 720.47

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Solution

The fourth proportional to 1,140.25, 1,573.15 and 720.47 is: 993.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.25 : 1,573.15 = 720.47 : x
  2. Step 2: Convert to fraction form
    1,140.25/1,573.15 = 720.47/x
  3. Step 3: Cross multiply
    1,140.25x = 1,573.15 × 720.47
  4. Step 4: Simplify right side
    1,140.25x = 1,133,404.41
  5. Step 5: Solve for x
    x = 1,133,404.41/1,140.25
  6. Step 6: Final answer
    x = 993.99

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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.