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Finding the Fourth Proportional to 745.95, 1,029.20 and 509.70

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Solution

The fourth proportional to 745.95, 1,029.20 and 509.70 is: 703.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.95 : 1,029.20 = 509.70 : x
  2. Step 2: Convert to fraction form
    745.95/1,029.20 = 509.70/x
  3. Step 3: Cross multiply
    745.95x = 1,029.20 × 509.70
  4. Step 4: Simplify right side
    745.95x = 524,580.69
  5. Step 5: Solve for x
    x = 524,580.69/745.95
  6. Step 6: Final answer
    x = 703.24

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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.