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Finding the Fourth Proportional to 317,220.61, 475,955.45 and 139,603.02

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Solution

The fourth proportional to 317,220.61, 475,955.45 and 139,603.02 is: 209,459.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,220.61 : 475,955.45 = 139,603.02 : x
  2. Step 2: Convert to fraction form
    317,220.61/475,955.45 = 139,603.02/x
  3. Step 3: Cross multiply
    317,220.61x = 475,955.45 × 139,603.02
  4. Step 4: Simplify right side
    317,220.61x = 66,444,819,815.79
  5. Step 5: Solve for x
    x = 66,444,819,815.79/317,220.61
  6. Step 6: Final answer
    x = 209,459.34

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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.