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Finding the Fourth Proportional to 86,643,378.81, 129,964,066.27 and 21,064,888.01

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Solution

The fourth proportional to 86,643,378.81, 129,964,066.27 and 21,064,888.01 is: 31,597,088.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,643,378.81 : 129,964,066.27 = 21,064,888.01 : x
  2. Step 2: Convert to fraction form
    86,643,378.81/129,964,066.27 = 21,064,888.01/x
  3. Step 3: Cross multiply
    86,643,378.81x = 129,964,066.27 × 21,064,888.01
  4. Step 4: Simplify right side
    86,643,378.81x = 2,737,678,501,574,016
  5. Step 5: Solve for x
    x = 2,737,678,501,574,016/86,643,378.81
  6. Step 6: Final answer
    x = 31,597,088.42

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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.