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Finding the Fourth Proportional to 620,427.30, 869,779.20 and 620,427.30

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Solution

The fourth proportional to 620,427.30, 869,779.20 and 620,427.30 is: 869,779.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,427.30 : 869,779.20 = 620,427.30 : x
  2. Step 2: Convert to fraction form
    620,427.30/869,779.20 = 620,427.30/x
  3. Step 3: Cross multiply
    620,427.30x = 869,779.20 × 620,427.30
  4. Step 4: Simplify right side
    620,427.30x = 539,634,760,652.16
  5. Step 5: Solve for x
    x = 539,634,760,652.16/620,427.30
  6. Step 6: Final answer
    x = 869,779.20

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1.5x scale

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.