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Finding the Fourth Proportional to 948.78, 1,309.35 and 529.12

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Solution

The fourth proportional to 948.78, 1,309.35 and 529.12 is: 730.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.78 : 1,309.35 = 529.12 : x
  2. Step 2: Convert to fraction form
    948.78/1,309.35 = 529.12/x
  3. Step 3: Cross multiply
    948.78x = 1,309.35 × 529.12
  4. Step 4: Simplify right side
    948.78x = 692,804.31
  5. Step 5: Solve for x
    x = 692,804.31/948.78
  6. Step 6: Final answer
    x = 730.21

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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.