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Finding the Fourth Proportional to 646.47, 970.11 and 256.41

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Solution

The fourth proportional to 646.47, 970.11 and 256.41 is: 384.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.47 : 970.11 = 256.41 : x
  2. Step 2: Convert to fraction form
    646.47/970.11 = 256.41/x
  3. Step 3: Cross multiply
    646.47x = 970.11 × 256.41
  4. Step 4: Simplify right side
    646.47x = 248,739.77
  5. Step 5: Solve for x
    x = 248,739.77/646.47
  6. Step 6: Final answer
    x = 384.77

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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.