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Finding the Fourth Proportional to 28,687,700.80, 42,973,490.40 and 17,871,803.20

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Solution

The fourth proportional to 28,687,700.80, 42,973,490.40 and 17,871,803.20 is: 26,771,534.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,687,700.80 : 42,973,490.40 = 17,871,803.20 : x
  2. Step 2: Convert to fraction form
    28,687,700.80/42,973,490.40 = 17,871,803.20/x
  3. Step 3: Cross multiply
    28,687,700.80x = 42,973,490.40 × 17,871,803.20
  4. Step 4: Simplify right side
    28,687,700.80x = 768,013,763,245,889.25
  5. Step 5: Solve for x
    x = 768,013,763,245,889.25/28,687,700.80
  6. Step 6: Final answer
    x = 26,771,534.21

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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.