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Finding the Fourth Proportional to 988.98, 1,365.83 and 675.69

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Solution

The fourth proportional to 988.98, 1,365.83 and 675.69 is: 933.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.98 : 1,365.83 = 675.69 : x
  2. Step 2: Convert to fraction form
    988.98/1,365.83 = 675.69/x
  3. Step 3: Cross multiply
    988.98x = 1,365.83 × 675.69
  4. Step 4: Simplify right side
    988.98x = 922,877.67
  5. Step 5: Solve for x
    x = 922,877.67/988.98
  6. Step 6: Final answer
    x = 933.16

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1.5x scale

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.