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Finding the Fourth Proportional to 985.21, 1,477.91 and 497.95

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Solution

The fourth proportional to 985.21, 1,477.91 and 497.95 is: 746.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.21 : 1,477.91 = 497.95 : x
  2. Step 2: Convert to fraction form
    985.21/1,477.91 = 497.95/x
  3. Step 3: Cross multiply
    985.21x = 1,477.91 × 497.95
  4. Step 4: Simplify right side
    985.21x = 735,925.28
  5. Step 5: Solve for x
    x = 735,925.28/985.21
  6. Step 6: Final answer
    x = 746.97

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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.