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Finding the Fourth Proportional to 208,603.47, 312,801.67 and 66,430.20

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Solution

The fourth proportional to 208,603.47, 312,801.67 and 66,430.20 is: 99,612.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,603.47 : 312,801.67 = 66,430.20 : x
  2. Step 2: Convert to fraction form
    208,603.47/312,801.67 = 66,430.20/x
  3. Step 3: Cross multiply
    208,603.47x = 312,801.67 × 66,430.20
  4. Step 4: Simplify right side
    208,603.47x = 20,779,478,754.48
  5. Step 5: Solve for x
    x = 20,779,478,754.48/208,603.47
  6. Step 6: Final answer
    x = 99,612.33

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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.