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Finding the Fourth Proportional to 66,218.40, 99,068.40 and 42,890.40

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Solution

The fourth proportional to 66,218.40, 99,068.40 and 42,890.40 is: 64,167.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,218.40 : 99,068.40 = 42,890.40 : x
  2. Step 2: Convert to fraction form
    66,218.40/99,068.40 = 42,890.40/x
  3. Step 3: Cross multiply
    66,218.40x = 99,068.40 × 42,890.40
  4. Step 4: Simplify right side
    66,218.40x = 4,249,083,303.36
  5. Step 5: Solve for x
    x = 4,249,083,303.36/66,218.40
  6. Step 6: Final answer
    x = 64,167.71

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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.