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Finding the Fourth Proportional to 78,312.90, 117,210.15 and 60,687.30

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Solution

The fourth proportional to 78,312.90, 117,210.15 and 60,687.30 is: 90,830.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,312.90 : 117,210.15 = 60,687.30 : x
  2. Step 2: Convert to fraction form
    78,312.90/117,210.15 = 60,687.30/x
  3. Step 3: Cross multiply
    78,312.90x = 117,210.15 × 60,687.30
  4. Step 4: Simplify right side
    78,312.90x = 7,113,167,536.10
  5. Step 5: Solve for x
    x = 7,113,167,536.10/78,312.90
  6. Step 6: Final answer
    x = 90,830.09

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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.