Home / 78,303.57-117,454.34-19,139.76

Finding the Fourth Proportional to 78,303.57, 117,454.34 and 19,139.76

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Solution

The fourth proportional to 78,303.57, 117,454.34 and 19,139.76 is: 28,709.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,303.57 : 117,454.34 = 19,139.76 : x
  2. Step 2: Convert to fraction form
    78,303.57/117,454.34 = 19,139.76/x
  3. Step 3: Cross multiply
    78,303.57x = 117,454.34 × 19,139.76
  4. Step 4: Simplify right side
    78,303.57x = 2,248,047,782.86
  5. Step 5: Solve for x
    x = 2,248,047,782.86/78,303.57
  6. Step 6: Final answer
    x = 28,709.39

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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.