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Finding the Fourth Proportional to 1,985.40, 2,978.16 and 524.52

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Solution

The fourth proportional to 1,985.40, 2,978.16 and 524.52 is: 786.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.40 : 2,978.16 = 524.52 : x
  2. Step 2: Convert to fraction form
    1,985.40/2,978.16 = 524.52/x
  3. Step 3: Cross multiply
    1,985.40x = 2,978.16 × 524.52
  4. Step 4: Simplify right side
    1,985.40x = 1,562,104.48
  5. Step 5: Solve for x
    x = 1,562,104.48/1,985.40
  6. Step 6: Final answer
    x = 786.80

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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.