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Finding the Fourth Proportional to 28,405,506.40, 42,629,254.80 and 18,817,698.40

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Solution

The fourth proportional to 28,405,506.40, 42,629,254.80 and 18,817,698.40 is: 28,240,456.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,405,506.40 : 42,629,254.80 = 18,817,698.40 : x
  2. Step 2: Convert to fraction form
    28,405,506.40/42,629,254.80 = 18,817,698.40/x
  3. Step 3: Cross multiply
    28,405,506.40x = 42,629,254.80 × 18,817,698.40
  4. Step 4: Simplify right side
    28,405,506.40x = 802,184,459,843,152.25
  5. Step 5: Solve for x
    x = 802,184,459,843,152.25/28,405,506.40
  6. Step 6: Final answer
    x = 28,240,456.22

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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.