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Finding the Fourth Proportional to 85,365.80, 128,018.63 and 28,424.24

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Solution

The fourth proportional to 85,365.80, 128,018.63 and 28,424.24 is: 42,626.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,365.80 : 128,018.63 = 28,424.24 : x
  2. Step 2: Convert to fraction form
    85,365.80/128,018.63 = 28,424.24/x
  3. Step 3: Cross multiply
    85,365.80x = 128,018.63 × 28,424.24
  4. Step 4: Simplify right side
    85,365.80x = 3,638,832,263.59
  5. Step 5: Solve for x
    x = 3,638,832,263.59/85,365.80
  6. Step 6: Final answer
    x = 42,626.35

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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.