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Finding the Fourth Proportional to 991.79, 1,485.84 and 497.62

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Solution

The fourth proportional to 991.79, 1,485.84 and 497.62 is: 745.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.79 : 1,485.84 = 497.62 : x
  2. Step 2: Convert to fraction form
    991.79/1,485.84 = 497.62/x
  3. Step 3: Cross multiply
    991.79x = 1,485.84 × 497.62
  4. Step 4: Simplify right side
    991.79x = 739,379.07
  5. Step 5: Solve for x
    x = 739,379.07/991.79
  6. Step 6: Final answer
    x = 745.50

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Double scale
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1.5x scale

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.