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Finding the Fourth Proportional to 78,898.30, 118,117.05 and 70,603.90

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Solution

The fourth proportional to 78,898.30, 118,117.05 and 70,603.90 is: 105,699.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,898.30 : 118,117.05 = 70,603.90 : x
  2. Step 2: Convert to fraction form
    78,898.30/118,117.05 = 70,603.90/x
  3. Step 3: Cross multiply
    78,898.30x = 118,117.05 × 70,603.90
  4. Step 4: Simplify right side
    78,898.30x = 8,339,524,386.50
  5. Step 5: Solve for x
    x = 8,339,524,386.50/78,898.30
  6. Step 6: Final answer
    x = 105,699.67

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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.