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Finding the Fourth Proportional to 988.64, 1,482.78 and 339.36

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Solution

The fourth proportional to 988.64, 1,482.78 and 339.36 is: 508.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.64 : 1,482.78 = 339.36 : x
  2. Step 2: Convert to fraction form
    988.64/1,482.78 = 339.36/x
  3. Step 3: Cross multiply
    988.64x = 1,482.78 × 339.36
  4. Step 4: Simplify right side
    988.64x = 503,196.22
  5. Step 5: Solve for x
    x = 503,196.22/988.64
  6. Step 6: Final answer
    x = 508.98

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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.