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Finding the Fourth Proportional to 28,386.40, 42,579.60 and 19,477.60

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Solution

The fourth proportional to 28,386.40, 42,579.60 and 19,477.60 is: 29,216.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,386.40 : 42,579.60 = 19,477.60 : x
  2. Step 2: Convert to fraction form
    28,386.40/42,579.60 = 19,477.60/x
  3. Step 3: Cross multiply
    28,386.40x = 42,579.60 × 19,477.60
  4. Step 4: Simplify right side
    28,386.40x = 829,348,416.96
  5. Step 5: Solve for x
    x = 829,348,416.96/28,386.40
  6. Step 6: Final answer
    x = 29,216.40

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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.