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Finding the Fourth Proportional to 1,290,392.40, 1,808,415.60 and 1,290,392.40

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Solution

The fourth proportional to 1,290,392.40, 1,808,415.60 and 1,290,392.40 is: 1,808,415.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290,392.40 : 1,808,415.60 = 1,290,392.40 : x
  2. Step 2: Convert to fraction form
    1,290,392.40/1,808,415.60 = 1,290,392.40/x
  3. Step 3: Cross multiply
    1,290,392.40x = 1,808,415.60 × 1,290,392.40
  4. Step 4: Simplify right side
    1,290,392.40x = 2,333,565,746,281.44
  5. Step 5: Solve for x
    x = 2,333,565,746,281.44/1,290,392.40
  6. Step 6: Final answer
    x = 1,808,415.60

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.