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Finding the Fourth Proportional to 9,985.70, 13,779.90 and 5,509.50

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Solution

The fourth proportional to 9,985.70, 13,779.90 and 5,509.50 is: 7,602.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,985.70 : 13,779.90 = 5,509.50 : x
  2. Step 2: Convert to fraction form
    9,985.70/13,779.90 = 5,509.50/x
  3. Step 3: Cross multiply
    9,985.70x = 13,779.90 × 5,509.50
  4. Step 4: Simplify right side
    9,985.70x = 75,920,359.05
  5. Step 5: Solve for x
    x = 75,920,359.05/9,985.70
  6. Step 6: Final answer
    x = 7,602.91

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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.