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Finding the Fourth Proportional to 66,658.60, 99,999.10 and 19,916.20

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Solution

The fourth proportional to 66,658.60, 99,999.10 and 19,916.20 is: 29,877.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,658.60 : 99,999.10 = 19,916.20 : x
  2. Step 2: Convert to fraction form
    66,658.60/99,999.10 = 19,916.20/x
  3. Step 3: Cross multiply
    66,658.60x = 99,999.10 × 19,916.20
  4. Step 4: Simplify right side
    66,658.60x = 1,991,602,075.42
  5. Step 5: Solve for x
    x = 1,991,602,075.42/66,658.60
  6. Step 6: Final answer
    x = 29,877.65

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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.