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Finding the Fourth Proportional to 208,603.56, 312,801.81 and 66,430.30

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Solution

The fourth proportional to 208,603.56, 312,801.81 and 66,430.30 is: 99,612.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,603.56 : 312,801.81 = 66,430.30 : x
  2. Step 2: Convert to fraction form
    208,603.56/312,801.81 = 66,430.30/x
  3. Step 3: Cross multiply
    208,603.56x = 312,801.81 × 66,430.30
  4. Step 4: Simplify right side
    208,603.56x = 20,779,517,545.95
  5. Step 5: Solve for x
    x = 20,779,517,545.95/208,603.56
  6. Step 6: Final answer
    x = 99,612.48

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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.