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Finding the Fourth Proportional to 978,420.36, 1,349,646.66 and 615,268.20

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Solution

The fourth proportional to 978,420.36, 1,349,646.66 and 615,268.20 is: 848,709.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,420.36 : 1,349,646.66 = 615,268.20 : x
  2. Step 2: Convert to fraction form
    978,420.36/1,349,646.66 = 615,268.20/x
  3. Step 3: Cross multiply
    978,420.36x = 1,349,646.66 × 615,268.20
  4. Step 4: Simplify right side
    978,420.36x = 830,394,671,134.21
  5. Step 5: Solve for x
    x = 830,394,671,134.21/978,420.36
  6. Step 6: Final answer
    x = 848,709.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.