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Finding the Fourth Proportional to 971.16, 1,339.95 and 656.58

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Solution

The fourth proportional to 971.16, 1,339.95 and 656.58 is: 905.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.16 : 1,339.95 = 656.58 : x
  2. Step 2: Convert to fraction form
    971.16/1,339.95 = 656.58/x
  3. Step 3: Cross multiply
    971.16x = 1,339.95 × 656.58
  4. Step 4: Simplify right side
    971.16x = 879,784.37
  5. Step 5: Solve for x
    x = 879,784.37/971.16
  6. Step 6: Final answer
    x = 905.91

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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.