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Finding the Fourth Proportional to 1,006.37, 1,509.21 and 312.95

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Solution

The fourth proportional to 1,006.37, 1,509.21 and 312.95 is: 469.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.37 : 1,509.21 = 312.95 : x
  2. Step 2: Convert to fraction form
    1,006.37/1,509.21 = 312.95/x
  3. Step 3: Cross multiply
    1,006.37x = 1,509.21 × 312.95
  4. Step 4: Simplify right side
    1,006.37x = 472,307.27
  5. Step 5: Solve for x
    x = 472,307.27/1,006.37
  6. Step 6: Final answer
    x = 469.32

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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.