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Finding the Fourth Proportional to 1,390,767.21, 1,918,929.78 and 787,155.21

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Solution

The fourth proportional to 1,390,767.21, 1,918,929.78 and 787,155.21 is: 1,086,088.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,767.21 : 1,918,929.78 = 787,155.21 : x
  2. Step 2: Convert to fraction form
    1,390,767.21/1,918,929.78 = 787,155.21/x
  3. Step 3: Cross multiply
    1,390,767.21x = 1,918,929.78 × 787,155.21
  4. Step 4: Simplify right side
    1,390,767.21x = 1,510,495,573,951.15
  5. Step 5: Solve for x
    x = 1,510,495,573,951.15/1,390,767.21
  6. Step 6: Final answer
    x = 1,086,088.00

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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.