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Finding the Fourth Proportional to 745.02, 1,117.62 and 312.30

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Solution

The fourth proportional to 745.02, 1,117.62 and 312.30 is: 468.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.02 : 1,117.62 = 312.30 : x
  2. Step 2: Convert to fraction form
    745.02/1,117.62 = 312.30/x
  3. Step 3: Cross multiply
    745.02x = 1,117.62 × 312.30
  4. Step 4: Simplify right side
    745.02x = 349,032.73
  5. Step 5: Solve for x
    x = 349,032.73/745.02
  6. Step 6: Final answer
    x = 468.49

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1.5x scale

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.