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Finding the Fourth Proportional to 143,788,679.40, 215,683,019.10 and 120,830,428.20

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Solution

The fourth proportional to 143,788,679.40, 215,683,019.10 and 120,830,428.20 is: 181,245,642.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,788,679.40 : 215,683,019.10 = 120,830,428.20 : x
  2. Step 2: Convert to fraction form
    143,788,679.40/215,683,019.10 = 120,830,428.20/x
  3. Step 3: Cross multiply
    143,788,679.40x = 215,683,019.10 × 120,830,428.20
  4. Step 4: Simplify right side
    143,788,679.40x = 26,061,071,553,321,780
  5. Step 5: Solve for x
    x = 26,061,071,553,321,780/143,788,679.40
  6. Step 6: Final answer
    x = 181,245,642.30

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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.