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Finding the Fourth Proportional to 103,672.90, 155,509.35 and 70,495.30

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Solution

The fourth proportional to 103,672.90, 155,509.35 and 70,495.30 is: 105,742.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,672.90 : 155,509.35 = 70,495.30 : x
  2. Step 2: Convert to fraction form
    103,672.90/155,509.35 = 70,495.30/x
  3. Step 3: Cross multiply
    103,672.90x = 155,509.35 × 70,495.30
  4. Step 4: Simplify right side
    103,672.90x = 10,962,678,281.06
  5. Step 5: Solve for x
    x = 10,962,678,281.06/103,672.90
  6. Step 6: Final answer
    x = 105,742.95

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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.