Home / 100,878.12-139,212.18-56,166.12

Finding the Fourth Proportional to 100,878.12, 139,212.18 and 56,166.12

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Solution

The fourth proportional to 100,878.12, 139,212.18 and 56,166.12 is: 77,509.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,878.12 : 139,212.18 = 56,166.12 : x
  2. Step 2: Convert to fraction form
    100,878.12/139,212.18 = 56,166.12/x
  3. Step 3: Cross multiply
    100,878.12x = 139,212.18 × 56,166.12
  4. Step 4: Simplify right side
    100,878.12x = 7,819,008,007.34
  5. Step 5: Solve for x
    x = 7,819,008,007.34/100,878.12
  6. Step 6: Final answer
    x = 77,509.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.