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Finding the Fourth Proportional to 21,356.42, 29,485.70 and 19,114.40

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Solution

The fourth proportional to 21,356.42, 29,485.70 and 19,114.40 is: 26,390.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,356.42 : 29,485.70 = 19,114.40 : x
  2. Step 2: Convert to fraction form
    21,356.42/29,485.70 = 19,114.40/x
  3. Step 3: Cross multiply
    21,356.42x = 29,485.70 × 19,114.40
  4. Step 4: Simplify right side
    21,356.42x = 563,601,221.08
  5. Step 5: Solve for x
    x = 563,601,221.08/21,356.42
  6. Step 6: Final answer
    x = 26,390.25

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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.