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Finding the Fourth Proportional to 1,390,930.02, 1,919,530.89 and 779,108.94

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Solution

The fourth proportional to 1,390,930.02, 1,919,530.89 and 779,108.94 is: 1,075,196.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,930.02 : 1,919,530.89 = 779,108.94 : x
  2. Step 2: Convert to fraction form
    1,390,930.02/1,919,530.89 = 779,108.94/x
  3. Step 3: Cross multiply
    1,390,930.02x = 1,919,530.89 × 779,108.94
  4. Step 4: Simplify right side
    1,390,930.02x = 1,495,523,677,005.16
  5. Step 5: Solve for x
    x = 1,495,523,677,005.16/1,390,930.02
  6. Step 6: Final answer
    x = 1,075,196.92

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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.