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Finding the Fourth Proportional to 926,643.40, 1,388,798.70 and 821,667.40

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Solution

The fourth proportional to 926,643.40, 1,388,798.70 and 821,667.40 is: 1,231,466.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    926,643.40 : 1,388,798.70 = 821,667.40 : x
  2. Step 2: Convert to fraction form
    926,643.40/1,388,798.70 = 821,667.40/x
  3. Step 3: Cross multiply
    926,643.40x = 1,388,798.70 × 821,667.40
  4. Step 4: Simplify right side
    926,643.40x = 1,141,130,616,952.38
  5. Step 5: Solve for x
    x = 1,141,130,616,952.38/926,643.40
  6. Step 6: Final answer
    x = 1,231,466.84

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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.