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Finding the Fourth Proportional to 28,318.40, 42,477.60 and 21,406.40

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Solution

The fourth proportional to 28,318.40, 42,477.60 and 21,406.40 is: 32,109.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,318.40 : 42,477.60 = 21,406.40 : x
  2. Step 2: Convert to fraction form
    28,318.40/42,477.60 = 21,406.40/x
  3. Step 3: Cross multiply
    28,318.40x = 42,477.60 × 21,406.40
  4. Step 4: Simplify right side
    28,318.40x = 909,292,496.64
  5. Step 5: Solve for x
    x = 909,292,496.64/28,318.40
  6. Step 6: Final answer
    x = 32,109.60

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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.